Since last month Apple announced that it would allow ad blockers in its Safari browser on mobile devices, ad blocker creators’ boast that their apps can save your battery life, shield you from malicious software, and spare you the nuisance triggered by slowly loading screens.

But a team of experts say that ad blockers can do one more thing for you – they can literally save your cash since they lower your device’s data usage. The team also reported that ad blockers in Safari can significantly decrease loading times, and save battery life by up to 21 percent.

For instance, some sites are so crowded with ads that they cost the user up to $9.50 in data usage by loading ads alone. Experts who performed the test said that ad-heavy sites which also feature video ads are the most damaging to users’ pocket.

The team tested 50 sites and found that up to 50 percent of data on the sites came as ads. Ads also throttled loading screens by 0.9 seconds to more than 30 seconds. The lowest loading time was 02 seconds, while the longest was 30.8 seconds.

One of the ad-heavy sites needed more than 30 seconds to load 15 MB of ad content and about 8 seconds to load editorial content. The other sites that were tested usually had 0.5 MB of ad content and 3 to 4 MB of editorial content, which means $0.01 stripped from your data plan for ads and $0.06 to load other content.

Ad blockers can also keep you safe from malicious software that can infest your device and trample on your privacy. According to a recent report, malware ads nearly tripled in 2014. Ad blockers can block these ads before they can infect your system. Additionally, some ad blockers can protect your privacy online because they have in-built features that disable trackers.

And ad blockers are a must have on mobile devices because just about every smartphone user knows how annoying ads on a small screen can be.

On the other hand ad blockers are not perfect and they have some drawbacks. For example, on some mobile sites you cannot shop on-line with an ad blocker on. Furthermore, ad blockers sometimes block neutral site content or entire sites. They also take away legitimate revenue from content providers by blocking ads.

In both the E.U. and U.S., advertisers tried to outlaw ad-blockers from web browsers. Last month, however, a German court ruled for a famous ad blocker creator, saying that the app does not stifle competition or breach copyright laws.